package map;

import java.util.*;

public class MapDemo2 {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>();
        map.put("语文", 99);
        map.put("数学", 98);
        map.put("英语", 97);
        map.put("物理", 96);
        map.put("化学", 95);
        System.out.println(map);

        Set<String> keySet = map.keySet();
        for (String key:keySet){
            System.out.println("key:"+key);
        }

        Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
        for (Map.Entry<String,Integer> e:entrySet){
            String key = e.getKey();
            Integer value = e.getValue();
            System.out.println(key+":"+value);
        }

        Collection<Integer> values = map.values();
        for (Integer value:values){
            System.out.println("value:"+value);
        }

        map.forEach(
                (k,v)-> System.out.println(k+":"+v)
        );
        Collection<String> c = new ArrayList<>();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        System.out.println(c);
        c.forEach(
                f-> System.out.println(f)
        );
    }
}
